The business of suing the federal government
Moreover, it might not be easy to rebottle that genie. A few Supreme Court rulings have likely made it more difficult to issue a similar finding again, absent specific instructions from Congress. And Congress seems pretty gridlocked on many environmental issues.

TL;DR
- 25 states' attorneys general are suing to uphold the EPA's move to scrap the "endangerment finding."
- The "endangerment finding" by the Obama-era EPA declared that greenhouse gases endanger public health and welfare.
- A lawsuit by environmental groups seeks to challenge the current EPA's move and reinstate the original finding.
- Removing the finding could eliminate key federal authority to regulate emissions from vehicles, power plants, and other sources.